Abstract: A lighting unit provides a twindling effect by having a plurality of individual lamps within one unit and having electrical driving means to illuminate the lamps at different time intervals, preferably with a degree of randomness.

Abstract: A polyvinylsolixane catalyst paste which comprises up to 20,000 ppm of finely divided platinum black which functions to adsorb hydrogen gas generated in the reaction of said catalyst paste when mixed with a base paste containing hydrofunctional polydimethylsiloxane, said base paste further containing a hydrophilic surfactant.

Abstract: The apparatus and method for measuring the amount of dissolved organic carbon in a sample utilizes an oxidation chamber wherein the dissolved organic carbon is ionized and a separate measuring chamber whereby an oxygen containing gas is pumped between the two chambers. The process water to be measured is used as both the reference water and sample.

Abstract: A storage rack for holding a plurality of substantially box-like containers. The rack is provided with a plurality of independent locking members, one associated with a single box-like container. The locking member may be rotated in and out of a locking position.

Abstract: A container comprising a top cover for placement on a base support. The top cover may be placed in a first position on the base support to allow steam or gas to enter within the container and a second position for providing a seal between the cover and base support.

Abstract: This invention relates to a fluorine-containing dental composition. The composition is particularly adapted for use in the field of dentistry as a composite filling material, cavity liner, adhesive, orthodontic resin, pit and fissure sealant, and denture base material wherein the fluoride is released to prevent secondary caries and reduce plaque formation.

Abstract: An indicating instrument, for example a temperature controller, which is responsive to a parameter, such as temperature, of an associated system or apparatus comprises a first display arranged in an annular configuration and providing a visual indication of a set-point value of the parameter, a handwheel to adjust the set-point value to a different set-point value, and a second display providing a visual indication of an operating condition of the instrument or of the current value of the parameter. This second display is located within the annulus of the analogue set-point display. Preferably, the second display provides an indication of the difference between the current value of the parameter and the set-point value as shown by the marker. A series of LEDs may be used as the second display.

Abstract: A device for cleaning a chimney flue having four side walls which comprises a rigid enlongated shaft, a fixed mounting plate means attached at one end of said elongated shaft, four scraping blades attached to said mounting plate means so as to collectively define a substantially rectangular or square perimeter, each of said blades having a scraping end and a fixed end pivotably attached to said mounting plate means remote from said scraping end, and means attached to said shaft within said perimeter for expanding and contracting said blades to permit cleaning of said four side walls of said flue at the same time.

Abstract: An apparatus for automatically selectively introducing successive samples of a liquid from at least one pressurized line into a receiving funnel having an outlet port and at least one inlet port. The receiving funnel has main receiving chamber for receiving liquid samples and a sensing device is also provided in the receiving funnel for sensing the level of liquid present in the receiving funnel for controlling flow in and out of the funnel.

Abstract: A dental impression material which comprises a pre-polymer formed by reacting a polyol or combination polyester polyol with a diisocyanate, and then with a hydroxyacrylate or hydroxymethacrylate; along with a metal catalyst, plasticizer, photosensitizer, reducing agent, filler and other additives. The essential characteristics of the polymer portion that makes the system work are that it is a long-chain aliphatic polyester-polyurethane molecule, which when endcapped with hydroxy arcylate moieties, is photo-polymerizable to yield a tear-resistant, highly flexible, medium-durometer elastomer, suitable for use as a dental impression material.

Abstract: A gate assembly comprising a pair of leaves positioned behind the opening of a housing. After an x-ray cassette is placed through the gate assembly, the leaves rotate to prevent entering of any additional x-ray cassettes or foreign objects.

Abstract: A visible light activated cavity liner which provides an available source of leachable calcium and fluoride to the base of a tooth cavity, said composition comprising a photopolymerizable matrix material, a photo initiator, a reducing agent, a synthetic hydroxyapatite filler and a powdered glass ionomer filler.

Abstract: A sterility indicator which comprises means defining an elongated outer compartment having liquid impermeable and substantially non-gas absorptive walls, said compartment having a closed end and a first opening at a distal end thereof and a second opening which is gas transmissive and bacteria-impermeable disposed at least partially around the perimeter of said outer compartment and located near said first opening, with a predetermined number of viable microorganisms suitable for monitoring steam sterilization being confined within said outer compartment adjacent said second opening, and a predetermined number of viable microorganisms suitable for monitoring gas sterilization being confined within said outer compartment away from said second opening and opposite said distal end; a closure member normally closing said first opening and movable to a second position to also close said second opening; and an inner compartment containing a nutrient medium disposed within said outer compartment with said nutrient m

Abstract: A method of forming a two step dental impression which comprises applying a light curable impression material to a portion of the oral cavity of interest to form an initial impression while exposing said impression material to a source of activating light to set said impression material followed by applying a chemically cured impression material over said light cured impression material and allowed said chemically cured impression material to set and bond with said light curable material and removing the resulting composite impression from said oral cavity.

Abstract: A package and method of packaging and dispensing a plurality of bottles or other like articles. The packages include a tray for supporting a plurality of bottles and a band around the perimeter of the bottles. A shrink wrap is placed around the bottles, band and tray. The tray is filled by placing the open edge adjacent the exit port of shaker dispensing table. The bottles are dispensed from the tray by moving the band to cause the bottles to slide over the open edge of the tray onto a receiving table.

Abstract: An orthodontic bracket in which the archwire is locked in place by a resilient locking loop member which snaps into and out of engagement over the bracket. The locking loop member is a nickel-titanium wire of high resilience and shape memory which not only locks in the archwire but imparts force against it as a function of the shape memory of the locking loop member.

Abstract: The present invention is directed to sterility indicators of the self-contained biological type and provides a device that assures direct impingement of the sterilant onto the microproorganisms. In this manner, the sterilant exposure conditions experienced by the test organisms reflects the exposure conditions to which the articles in the sterilizer are subjected. The device of the invention provides that the microorganisms are not directly contiguous with the ampule containing the aqueous nutrient medium.

Abstract: An electrosurgical generator for use with a living being. The electrosurgical generator is provided with a circuit for determining real power output being delivered to a handpiece. A switching mechanism is also provided to allow alternate selection of the desired power to the desired output port.

Abstract: A plastic filterware having a filter membrane consisting essentially of cellulose nitrate welded to a surface of a membrane support member.The weld can be substantially in the shape of a ring having a width of about 2.29 millimeters. The filterware can include an upper receiving chamber for receiving liquid to be filtered, a support member at the lower end of the receiving chamber and a lower receptacle below the support member of receiving filtrate.